Software engineer with 8+ years shipping Android and Flutter apps to millions of users across Indonesia, Singapore, and Japan. Founder of Rancangin Aja, a software house and AI product studio. I care about Clean Architecture, maintainable code, and actually shipping.
Nine apps across logistics, property, auctions, news, AI video, and cross-border commerce. Shipped for clients in Indonesia, Singapore, Japan, and Australia, plus products of my own.
Rancangin Aja (in-house product) · Founder & Lead Engineer
Long videos. A whole lot of great stories.
AI video clipper that turns long videos into short, meaningful clips. Finds hooks with AI, cleans up transcripts, adds captions, and exports for social media on Mac, iPhone, iPad, and Android.
Bundd, Australia · via Rancangin Aja · Lead Engineer
From anywhere, to you. A cross-border shopping marketplace.
Marketplace that connects shoppers who want items from abroad with travellers who can buy and bring them, or carry them in spare luggage. Built end to end through Rancangin Aja for an Australian founder: Flutter app with in-app chat, listings for both models, escrow-style payments via Stripe Checkout, order tracking with a six-state flow, traveller verification, and an admin queue, on a Supabase backend.
99 Group · Flutter Engineer
Property agent app for Indonesia's largest listing platform.
The agent-side app of Rumah123 for listing, managing, and marketing properties. Led the migration from native Kotlin and Swift to a unified Flutter codebase with modular Clean Architecture and a full analytics stack.
99 Group / StreetSine Singapore · Flutter Engineer
Singapore's property search and valuation app.
Property search, X-Value valuation, and agent tools for the Singapore market. Re-architected the app in Flutter with a modular Clean Architecture, migrating away from a legacy React Native implementation.
PT Serasi Autoraya (Astra) · Senior Android Developer
Vehicle auction platform from Astra International.
Official auction app of IBID (Serasi Autoraya, an Astra International company) for browsing lots, bidding, and winning vehicles. Led development with Kotlin and pioneered Jetpack Compose adoption after refactoring the legacy Java MVP codebase.
PT Kompas Media Nusantara · Android Developer
Digital daily newspaper from Indonesia's leading publisher.
Kompas digital news and e-paper app with article mode, editions, and books. Built with a modular architecture and Jetpack Compose for a modern, responsive reading experience.
PT Mengantar Karya Bangsa · Senior Mobile & Backend Developer
Logistics and delivery platform for online sellers.
Shipping aggregator that lets sellers compare couriers, book pickups, and track packages. Led the end-to-end migration from React Native to Flutter, automated CI/CD, and raised stability with systematic crash monitoring.
PT Mengantar Karya Bangsa · Senior Mobile & Backend Developer
Online ordering platform for e-commerce sellers.
Order-form builder and checkout platform that helps sellers collect orders from social media and ads. Built from the ground up in Flutter with reusable UI components, backed by an Express.js, MongoDB, and Redis service.
Rancangin Aja (in-house product) · Founder & Lead Engineer
Smart rental manager for boarding houses.
A smart way to manage boarding houses and rentals: properties, units, tenants, and rent billing with reminders for overdue payments. Designed, built, and published as an in-house Rancangin Aja product.
Full-time roles, freelance contracts, and mentoring, from native Android in 2018 to running my own studio today.
Software house and AI product studio. Lead product development end to end and shipped two in-house products, Cuplikin and KosPro, alongside client work for Indonesia, Japan, and Australia, including bundd, a cross-border shopping marketplace.
Led the React Native to Flutter migration of the Mengantar logistics platform, built Formulir and its Express.js backend from scratch, and raised the crash-free rate from 80% to 98%.
Built ninaite.ai, a residence-status platform for foreign skilled workers in Japan: Rails web app and backend plus the Talent and Client apps in Flutter. Three production apps in six months.
Migrated Rumah123 Pro from native Kotlin and Swift to Flutter and re-architected SRX Property from React Native, serving over 1 million users across Southeast Asia.
Led the IBID Balai Lelang Astra auction app: refactored legacy Java MVP to Kotlin Clean Architecture, pioneered Jetpack Compose, and scaled to 500K+ monthly active users with a 99.27% bug reduction.
Developed Kompas Harian, the digital daily for over 1 million readers, with a modular architecture and Jetpack Compose.
Binar Academy
Authored the official Android curriculum and mentored 100+ students on Kotlin, Jetpack Compose, and Clean Architecture. 20+ mentees placed at Astra, OLX, Kompas, Privy, and Ajaib.
Anakaiti.id
Built Otobagus, a real-time vehicle auction platform, from the ground up in Flutter with MQTT-based live bidding for thousands of concurrent users.
PT Aman Informasi
Built Chatme, a secure real-time chat app for internal corporate communication, from concept to deployment with Flutter and Firebase Realtime Database.
PT Visiary
Co-developed the Visiary video editing platform and led Wakaf Ikhlas, a digital waqf donation app for Bank BJB Syariah, through to Play Store release.
Mobile first, but comfortable across the stack: backend services, web frontends, infrastructure, and AI integration.
Developer tooling that enforces the architecture I use on every project, so teams start right and stay right.
Claude Code and Codex plugins that enforce Clean Architecture, modularization, and standardized patterns for mobile, web, and backend teams. Installable from the plugin marketplace with one command.
A high-performance CLI written in Rust for scaffolding and managing modular Flutter projects with Clean Architecture.
Practical write-ups on Flutter, Android, architecture, and AI tooling, drawn from real production work.
What I learned leading two React Native to Flutter migrations (Mengantar and SRX Property): how to sequence the rewrite, keep releases flowing, and avoid the traps that stall most migrations.
The exact package layout, dependency rules, and conventions behind the Flutter apps I ship, from 100K concurrent users at Mengantar to small in-house products. Opinionated, and battle-tested.
The step-by-step process we used at Mengantar to raise the crash-free user rate from 80% to 98% on an app with over 100,000 concurrent users. No rewrites, just discipline and the right instrumentation.
Looking for a Senior Mobile Engineer (Flutter / Android) role, full-time or contract, remote only. Also at home in React Native and iOS (Swift) codebases, including teams migrating to Flutter. Based in Indonesia (GMT+7), a natural overlap with Southeast Asia, Hong Kong, China, Japan, Korea, and Australia, and with European mornings. Flexible hours for the right team. Pick a channel or book a slot.